Heidi Montag is a dirty girl on the cover of the September issue of Playboy Magazine, but the fame-hungry reality star recently confessed that her father still doesn’t know she bared all for the iconic men’s mag!

Bauer-Griffin

Heidi is featured on the cover of the “tasteful” new issue of Playboy, posing in a white bikini covered in mud. (Yeah, that sounds really wholesome, Heidi.) The Hills starlet revealed the cover image at last week’s Hollywood premiere of G.I. Joe. Nonetheless, Heidi hasn’t had the courage to break news of the photoshoot to her Bible-thumpin’ dad.

“I’m very religious. I’m a big Christian girl. I kinda wanted to keep those values a little bit. I haven’t told my dad yet. I might not tell him,” she tells Extra. “My mom was so excited she was just, like, pose! God gave you that body, you show off that cute little thing.”

Heidi’s Playboy debut arrives on newsstands this Friday.